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PDFBOX for Persian document

I want to use pdfBox to extract test from Persian pdf files, but it returns "?" for all the Persian characters (it returns correctly the Latin words in the same document).
How can I fix it? Any advice?

Sadly, the provided file has the persian text as vector graphics, not as text from fonts, so it cannot be extracted. You'll have to use OCR for it.
See also the text extraction FAQ:
How come I am not getting any text from the PDF document?
Text extraction from a pdf document is a complicated task and there
are many factors involved that effect the possibility and accuracy of
text extraction. It would be helpful to the PDFBox team if you could
try a couple things.
Open the PDF in Acrobat and try to extract text from there. If Acrobat
can extract text then PDFBox should be able to as well and it is a bug
if it cannot. If Acrobat cannot extract text then PDFBox ‘probably’
cannot either.
It might really be an image instead of text. Some PDF documents are
just images that have been scanned in. You can tell by using the
selection tool in Acrobat, if you can’t select any text then it is
probably an image.

How to get the line count of pdf using java

I need to get the number of lines in pdf file using java.
I used itext-2.1.7.jar to get the page count.
Is there any way to get the count of lines in pdf.

There's no easy way to do this, only aproximations. That problem is that a pdf page is a canvas with drawings at arbitrary locations and some of them happen to be fonts and text.
An approach is to extract the text and from the text location build a list of what you will consider a line. Use LocationTextExtractionStrategy to get this result but you'll have to use the more recent jar, itext 2.1.7 is too old and doesn't work that well with text extraction.

Insert text to a generated pdf document

I have a library which generates pdf document with images.
I want to be able to add text after each image. What is the syntax for that? How to insert text into pdf documents?
I have to use the library I have, not another one.

First of all, mkl is correct, have a look at the specification for all of the details. PDF is an exact language, if you make mistakes they will routinely be punished severely once you open the PDF in viewers.
Secondly, when you think about putting text on the page, don't forget that besides the text operators to draw the text on the page, you'll also have to specify the font to use to draw this text. Which will include making sure there is a font resource included in the PDF file if your library doesn't automatically handle all of that for you.
If you want to cut corners (I shiver while writing this) and perhaps don't read the specification as thoroughly, try this.
1) Create a PDF file that looks more or less like what you want.
2) Use a tool such as pdfToolbox from callas (http://www.callassoftware.com/callas/doku.php/en:download) or Browser from Enfocus (http://www.enfocus.com/en/products/browser). Both of these tools allow you to investigate the low-level structure of a PDF file, including looking at the actual page description code. This will show you how fonts are embedded (if you have to do it yourself that could be very handy) and how text is rendered on the page (and how you set the font, size, color etc... to use).

Replace text with an image docx4j

I have an word template. There is an word photo that has to be replaced with an image. This has to be done with Docx4Java.
How do I do this?

If specifically looking to replace a text with an image(which is not possible using docx4j as answered above), you can use replace bookmark with image as an alternative.
Just open your templated word file, position the cursor at desired location and insert->bookmark and name your bookmark.
I followed the instructions here to replace this bookmark with an image

Disclosure: I manage the docx4j project
The VariableReplace code doesn't handle images.
The best way to do this would be to use data bound content controls, specifically a picture content control pointing via XPath at a base-64 encoded image in an XML document (see Getting Started for details).
However, if you want to replace a word with an image, you can do so, but you'll have to write a bit of glue code. It is pretty straightforward.
First, find the word. You can do this using XPath or TraversalUtil (again, see Getting Started for details).
Hopefully it is in a run (w:r/w:t) by itself. If not, you'll need to split the run up so you don't replace adjacent text.
Then, add the image. See the sample ImageAdd.
I suggest you have a look at the XML created when you add an image in Word (ie save and unzip your docx, then look at document.xml). Take care that the XML representing the image is at the correct level (eg child of w:p).

Editing a PDF file with Java

I'm trying to edit a existing PDF file. It is a file where I need to fill in some addresses and other stuff. I want to connect an addressbook to the application so the user can select a user from the addressbook and a part get filled in automatic.
My questions are:
Is it possible to edit a existing PDF file and fill in some fields (+/- 20), because I know there is Itext (http://www.itextpdf.com) but I read that the possiblities are very small.
Or can I better convert the PDF to JPG and get it as background. And create JLabels on the places where I need to fill in the fields. And then print the whole Frame on a A4.
Or are there better posibilities?
So what I need to do, step by step:
Select one of the PDF's (they are in the program)
Fill some fields with content/addresses
Print the PDF/Form with a printer

There is a toolkit given by Adobe named as Acrobat Forms Data Format (FDF) Toolkit which gives API for different languages to fill forms.
You can get the java code at the bottom of that page or check this link

We didn't edit existing PDF's but created totally new letters/reports/doco from our java app using iReport

You could use pdf form and edit field values programmatically using IText or Apache PDFBox (download pdfbox and see SetField.java example)